A A, neke da moze tako, imas kratak spoj, i ne dobijas tako dvostrano napajanje,jedino je moglo onako sa dve diode ali iskoriscavas samo 50% transformator, postoje IC kola koja pretvaraju sa jednostranog u dvostrano napajanje ili iz asimetricnog(jednostrano) u simetricno napajanje, ali obicno za odrdejene napone i struje(manje).
Evo i objasnjenja ali kao sto vidis problem je malo manji napon od pozitivnog, i max struja do 40mA.
Pozitivni napon mozes sniziti tako sto ces za + napajanje posle grananja sa kolom za negativni napon staviti 1-2 diode reda 1N4001 i dobiti nizi napon pozitivni, odnosno priblizno isti kao i negativni.
Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual supply is not affordable or not practicable.
This circuit solves the problem to a certain extent. It provides a negative voltage from a single positive supply. This negative voltage together with the positive supply can be used to power the opamps and other circuits requiring a dual supply.
The circuits operation can be explained as follows:
The 555 IC is operating as an astable multivibrator with a frequency of about 1kHz. A square wave is obtained at the pin 3 of the IC . When the output is positive, the 22uF capacitor charges through the diode D1. When the output at pin 3 is ground, the 22uF discharges through the diode D2 and charges the 100uF capacitor is charged. The output is taken across the 100uF capacitor as shown in the figure.
A disadvantage of this circuit is its poor voltage regulation and current limit. The max. current that can be drawn from this circuit is about 40mA. If you draw more current, the regulation will be lost.
Also the output negative voltage will be a little less than the positive supply due to the diode drops. For example if the voltage is +9V then the output voltage will be about 7.5 V.
[Ovu poruku je menjao Pigoza dana 08.06.2009. u 13:02 GMT+1]
Blago onome ko zna da ne zna, a hoce da zna.
Covek se uci dok je ziv, pa opet lud umre.